RFR: JDK-8172548 unpack200 fails linking with new update of SS12u4

[Magnus Ihse Bursie]

When building with Solaris Studio 12u4, linking of unpack200 fails. The 
fix is to include "environ" in the mapfile.

This patch is contributed by Douglas Simon.

Bug: https://bugs.openjdk.java.net/browse/JDK-8172548
Patch inline:
diff --git 
a/make/mapfiles/libunpack/mapfile-vers-unpack200-solaris-sparc 
b/make/mapfiles/libunpack/mapfile-vers-unpack200-solaris-sparc
--- a/make/mapfiles/libunpack/mapfile-vers-unpack200-solaris-sparc
+++ b/make/mapfiles/libunpack/mapfile-vers-unpack200-solaris-sparc
@@ -28,6 +28,7 @@
  SUNWprivate_1.1 {
         global:
                 # These are needed by the c runtime in SS12u4
+               environ;
                 _environ;
                 __environ_lock;
                 ___Argv;


/Magnus